Conflict of interest

The author has no conflict of interest.

Ethical approval

This manuscript respects the ethic policy of CHU Lyon for the treatment of human research participants.

Patient consent

No patient-identifying data were used. The authors did not obtain written informed consent from the patient but the patient did not object to his data being used for research purposes (as required by ethic policy of CHU Lyon).

Permission to reproduce material from other sources

The authors declare no use of third-party material in this study for which formal permission is required.